A 50-year-old woman visits her doctor with complaints of bruises that will not heal. Her doctor has had her on long-term antibiotic treatment to control some chronic infections
Which of the following explains how her antibiotic treatment is related to her bruising?
A) The antibiotics weaken the cells lining her capillaries, causing them to leak blood into the surrounding tissues.
B) The antibiotics have traveled to her liver and are now preventing the liver from producing proteins that circulate in the blood and help with clotting.
C) The antibiotics have destroyed the "good" bacteria in her large intestine that produce vitamin K, which is important for proper blood clotting.
D) She is malnourished because the antibiotics have destroyed the "good" bacteria in her digestive system that are responsible for producing the digestive enzymes that she needs to break down her food.
C
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Red imported fire ants are an invasive species in United States. How have they harmed the Texas horned lizard, which feeds on native ants?
a. They act as parasites on the lizards. b. They are poisonous to the lizards. c. They damage the lizard's breeding area. d. They increase the amount of predatory birds, which eat lizards. e. They have replaced many native ant populations, so the lizards have less food.
In a eukaryote, DNA polymerase can add up to
a. 1,000 nucleotides per second. b. 500 nucleotides per second. c. 50 nucleotides per second. d. 10 nucleotides per second. e. one billion nucleotides per minute.
The ability of living organisms to maintain a constant internal environment despite changes in the external environment is ________
Fill in the blank(s) with correct word
Germination requires the use of metabolic reserves in the seed. Which of these compartments contains starch used to fuel early seedling growth?
A. Mitochondria B. Protoplasts C. Chloroplasts D. Chromoplasts E. Amyloplasts